• county
  • FIPS 18031
  • Largest town: Greensburg

Decatur County, Indiana

Decatur County had 26,421 residents in the Census Vintage 2024 estimate, on 372.6 square miles of land. It ranks 60th of 92 in Indiana by population and 62nd by land area.

Population
26,421
#60 of 92 in Indiana · #1,560 in US
Area
372.6 sq mi
#62 of 92 in Indiana · #2,624 in US
Density
71 / sq mi
#58 of 92 in Indiana · #1,169 in US
Median household income
$71,150
#30 of 92 in Indiana · #918 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Decatur County within Indiana. Pin: Indianapolis.

Measure from here

Tools and pages that start from Decatur County

Decatur County population, land area and income

Decatur County had 26,421 residents in the Census Vintage 2024 estimate, on 372.6 square miles of land. It ranks 60th of 92 in Indiana by population and 62nd by land area. That works out to 70.9 people per square mile, below the US average of 96.3, and above the national county median.

The median county-equivalent in Indiana has 34,874 residents; Decatur County is somewhat smaller.

Its SAIPE 2023 median household income of $71,150 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

26,421

3144th1st

1560th of 3,144 (US)

Land area

373 sq mi

3144th1st

2624th of 3,144 (US)

Density

70.9 / sq mi

3144th1st

1169th of 3,144 (US)

Median household income

$71,150

3143rd1st

918th of 3,143 (US)

Rank within Indiana (92)

Population

26,421

92nd1st

60th of 92 (IN)

Land area

373 sq mi

92nd1st

62nd of 92 (IN)

Density

70.9 / sq mi

92nd1st

58th of 92 (IN)

Median household income

$71,150

92nd1st

30th of 92 (IN)

How Decatur County's population changed since 2020

Decatur County lost 55 residents between the July 2020 and July 2024 estimates, a drop of 0.2%. That ranks 75th of 92 in Indiana for growth. The median Indiana county changed by +0.8%, and the state as a whole by +2.0%.

Since the April 2020 estimates base, Decatur County recorded 1,316 births and 1,498 deaths, a natural change of -182. Net international migration added +85 and net domestic migration, people moving to or from other US counties, came to +39. The largest single component was natural change, which removed 182 people.

26.5k202026.4k202126.5k202226.4k202326.4k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
1,316
Deaths
1,498
Net international migration
+85
Net domestic migration
+39
Change, July 2023 to July 2024
+26

Where Decatur County is

The Census internal point of Decatur County is at 39.306000, -85.499800. It sits in UTM zone 16N. The map shades Indiana's 92 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Decatur County outlined. Dots are towns of 1,000+ people with residents in it.

Vigo County: +0.0%Fayette County: -0.1%Grant County: -0.1%Noble County: +0.7%Clay County: -0.0%Fulton County: -2.3%Henry County: +0.3%Jasper County: +1.5%Carroll County: +2.0%Huntington County: +0.8%Howard County: +0.6%Tipton County: -0.4%Starke County: +0.3%Lawrence County: +0.4%Jennings County: +0.2%Jay County: -1.5%Greene County: +1.3%Blackford County: -2.4%Madison County: +3.1%Parke County: +2.1%DeKalb County: +2.4%Scott County: +1.5%Benton County: +1.7%Wells County: +2.3%Wabash County: -0.5%Union County: -2.8%Marshall County: +0.8%Putnam County: +3.1%Clinton County: -0.8%Hamilton County: +8.8%Hancock County: +10.8%Jackson County: +2.0%Hendricks County: +8.5%Johnson County: +5.1%Decatur County: -0.2%Lake County: +0.8%Newton County: +2.5%Fountain County: +2.1%Crawford County: +0.0%Perry County: +0.9%Martin County: +0.6%Dearborn County: +1.3%Morgan County: +2.8%Monroe County: +0.0%Switzerland County: +2.5%Ohio County: +1.2%Sullivan County: -0.2%Franklin County: +1.5%Adams County: +2.0%Jefferson County: -0.5%Knox County: -1.1%Ripley County: +0.8%Vanderburgh County: +0.0%Gibson County: -0.1%LaGrange County: +1.5%Dubois County: -0.0%Harrison County: +0.8%Randolph County: -0.3%Brown County: +1.1%Shelby County: +1.3%Tippecanoe County: +2.8%Daviess County: +2.2%Delaware County: +1.1%Elkhart County: +0.2%Whitley County: +1.6%Allen County: +3.4%Montgomery County: +1.8%Miami County: -0.8%St. Joseph County: +0.4%Kosciusko County: +0.6%Floyd County: +1.8%Rush County: -0.1%Wayne County: -0.2%Posey County: -0.5%Clark County: +5.0%Orange County: -0.1%Marion County: +0.5%Boone County: +10.7%Porter County: +1.5%Steuben County: +1.2%Vermillion County: +0.8%Cass County: -0.6%Owen County: +2.5%White County: +0.6%Washington County: +0.4%Pulaski County: -0.8%Pike County: -1.1%Warren County: +0.3%Warrick County: +3.7%Spencer County: +1.8%LaPorte County: -0.8%Bartholomew County: +3.1%
Change 2020 to 2024
  1. < -0.2%
  2. < +0.4%
  3. < +1.2%
  4. < +2.1%
  5. ≥ +2.1%
no data

Orange pin: Decatur County internal point. Dark pin: Indianapolis.

Internal point

Decimal
39.306000, -85.499800
DMS
39°18'21.60"N 85°29'59.28"W
UTM
16N 629346.5E 4351807.4N
Geohash
dngpw7kyn
Plus code
86FP8G42+93

Towns in Decatur County

2 incorporated places of 1,000+ people have residents in Decatur County, 13,708 people together, or 52% of the county. Each figure counts only the part of the town inside Decatur County; towns marked "part" extend into another county. The largest is Greensburg with 12,317.

  1. 01Greensburg12,317
  2. 02Westport1,391
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Decatur County

The Census 2024 county adjacency file lists 6 neighbors for Decatur County. The most populous is Bartholomew County, IN, with 84,741 residents. Distances run between Census internal points in a straight line.

Distance to Indianapolis and the nearest big city

Indianapolis is 47.5 miles NW of Decatur County's internal point in a straight line. The nearest place of 100,000 or more is Indianapolis, IN (population 891,484), 47.3 miles away. The nearest place of 10,000 or more is Greensburg, IN (population 12,317), 3.1 miles away.

Decatur County FIPS code

The FIPS code of Decatur County is 18031: state code 18 for Indiana plus county code 031. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $71,150.

Questions people ask

What is the population of Decatur County, Indiana?

The Census Vintage 2024 estimate for July 1, 2024 is 26,421. That is down 55 people (0.2%) from the July 2020 estimate of 26,476.

What is the FIPS code of Decatur County?

18031. The first two digits (18) are Indiana; the last three (031) identify the county.

What is the largest town in Decatur County?

Greensburg, with 12,317 residents inside Decatur County in 2024.

Which counties border Decatur County?

6 county-equivalents border it in the Census 2024 adjacency file: Bartholomew County, IN; Shelby County, IN; Ripley County, IN; Jennings County, IN; Franklin County, IN; Rush County, IN.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.